All you need for a movie are two guys and two guns. Unless that movie is 2 Guns, in which case you probably need a good deal more. The movie's pleasures, whatever they may be, stem from a kind of summer-diversion déjà vu. The tagline could be, "If you like things like 2 Guns, you'll love 2 Guns!” Because it all feels that familiar. There are a few differentiating details, of course. One character is an undercover DEA agent, the action-movie equivalent of a comfy shoe: When Denzel Washington’s Bobby Trench is consorting with baddies, he just slips in a set of gold fronts. Bobby's partner-- or, rather, the guy Bobby works with who doesn't realize he's Bobby's partner-- is Mark Wahlberg's Marcus "Stig" Stigman, a naval intelligence officer gone AWOL. Now that's something we don’t see every day, and Stig's gradually unfolding backstory is one of the mechanisms that keeps 2 Guns moving forward. In the end, we may not learn all we want to know about Stig, but there's a decent amount of rough-and-tumble gunplay and ludicrous banter in between. Bobby and Stig kick things off by robbing a small-town bank--later, we learn more about why--and along the way, they run afoul of a lawman with a weirdly elastic sense of justice, played by a smooth-talking, bolo-tie-wearing Bill Paxton. Watching him slither between the cracks of right and wrong is one of the movie's pleasures; Washington, smooth as a satin sheet, is always devilishly pleasing to watch in his more comic roles, and he doesn't disappoint. But this is a here today, gone tomorrow trifle, albeit one with lots of gunplay.